Question

Which one of these equation is balanced by charge
Sn^2+=Sn^4- + 2e
Sn^4+=Sn^2+
Sn^4+2e=Sn^4+

Answer 1

The bot can't count.

Answer 2

The equation that is balanced by charge is:

Sn^2+ + 2e = Sn^4-

In this equation, the charge on the left-hand side (2+) is balanced by the charge on the right-hand side (4-).